Cake Talk by Anand Utsav Kapoor

The talk will focus on the development of a new emission library called TODDLERS (= Time Evolution of Observables Including Dust Diagnostics and Line Emission from Hii Regions), which produces time-dependent emission diagnostics from gas and dust around young stars for simulated galaxies. The library is generated using semi-analytic calculations that allow for the sweeping of a large parameter space while accounting for complex feedback physics in an idealized fashion. The dominant feedback channel evolves as a function of metallicity, with the gas being predominantly pushed by stellar winds and SNe at high metallicities and Ly-alpha radiation pressure at the lowest metallicities.

TODDLERS is then passed on to Cloudy for detailed chemistry calculations, producing time-dependent UV-submm observables. The observables include emission lines originating from ionized, photo-dissociation, and molecular regions along with the nebular, stellar, and dust continuum emission. The BPT diagram and the IRAS color-color diagram are used to map the parameter space of the models onto the observable space, demonstrating that they populate the expected regions when compared to observational data.

The talk will also cover the integration of these observables into SKIRT for post-processing simulations. A comparison between the IR colors produced by TODDLERS and the currently only available Hii emission library in SKIRT shows that TODDLERS' colors are in much better agreement with observations. This work serves as a proof of concept, and future work will explore the effects of varying the stellar IMF, elemental abundance sets, and dust models using TODDLERS.